Delete row sig_2123e4792882 from signals

id sig_2123e4792882
event_id evt_903d946371f5
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_93d05fd02 ...
dedupe_key signal_enriched:news_delta:c5df247175a32a6c
throttle_s 0
created_at 2026-04-21T19:56:17.229824+00:00
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